Telephone-transmitter.



. Pated 060.01911.'

H. P. CLAUSBN. TELEPHONE TRANSMITTER,

.APPLICATION FILED AUG. 20, 1902.

d UNITED sTATEs PATENT OEErcE.

HENRY 1. oLAUsEN, or CHICAGO, ILLINOIS, ASSIGNOR, BY MEsNE ASSIGNMENTS,- To

`STROIlVlBlJEtGr-CAR-LSON TELEPHONE MANUFACTURING COMPANY, OF ROCHESTER, NEW YORK, A CORPORATION OF NEW YORK.

TELEPHONE-TRANSMITTER.

To all whom it may concern;

Be it known that I, HENRY P. CLAUSEN, a citizen of the United States of America, and resident of Chicago, Cook county, Illinois, have invented a certain new and useful Improvement in Telephone Transmitters, of which the following is a specification.

My invention relates to telephone transmitters constructed on the microphone lprinciple, and involving a main diaphragm, and one or more supplemental diaphragms, with granular carbon interposed between the front and back electrode surfaces.

Generally stated, it is the object of my invention to provide a simple, compact, comparatively inexpensive, highly sensitive, i and etlicient telephone transmitter of ing character.

A special object is to provide a construction tending t0 insure a beneicialcoperation between the main diaphragm and one or more supplemental diaphragms. Another object is to provide improved means for connecting the supplemental diaphragm with the main diaphragm, and for permitting the central port-ion of the main diaphragm to have a more or less independent action as a supplemental diaphragm.

It is also an object to provide certain details and features of improvement tending the foregoto increase the general etliciency and serv-l iceability of a telephone instrument of this character.

In the accompanying drawings, Figure 1 is a longitudinal section of a telephone transmitter constructed in accordance with my invention. Fig. 2 is a sectional view of the main diaphragm, supplemental diaphragm, and the supporting or clamping rings, showing the same separated one from the other.

As thus illustrated, my improved transmitter may comprise a suitable body or casing A, of any known or approved construction. It may also comprise a mouth-piece B, and a main diaphragm C. The said diaphragm can'be clamped or held upon the casing in any suitable manner, as, for example, by employing the bridge D, which will also serve as the solid backing for the microphone. The supplemental diaphragm E is arranged back of the main diaphragm and in front of the bridge, as shown in the draw- Specicaton of Letters Patent.

Patented Dec. 5, 1911.

Application filed August 20, 1902. Serial No. 120,282.

be of any known or approved material, as,

for example, mica. The supplemental diaphragm can be clamped uponthe backof the separating ring by means of a anged and threaded clamping ring G. The said separating ring can be secured to the main diaphragm in any suitable manner, as, for example, by means of rivet-s c. The main diaphragm` preferably carries a front electrode surface, as, for example, the face of the carbon block c1. The supplemental diaphragm also preferably carrles a back electrode surface, which can also be the face of the carbon block I. A screw or bolt-like device h. can be employed for clamping or securing the block of carbon c1 to the main. diaphragm, while a bolt or stem z' can be employed for connecting the supplemental diaphragm and the carbon block I with the bridge. If desired, the supplemental dia.- p-hragm can be clamped between the carbon block I onthe inside, and a metal block 1 on the outside.

It will be understood that the connection between the stem or bolt c' and the bridge can be of any suitable character. With this arrangement it will be seen that the main diaphragm will not only have a bodily vibratory movement, thereby carrying the front electrode away from the back electrode, which latter is stationary, but also that the central portion of the main diaphragm will have a certain amount of independent movement, inasmuch as it is connected along the line of a circle with the separating ring F. Thus the main diaphragm is capable of vibrating as a whole, so as to cause the front electrode to move toward and away from the back electrode, and, in addition, the central portion of the diaphragm can have more or less, or at least a slight, independent vibration, the supplemental diaphragm, it will be seen, moves only at its marginal portions, it serving practically as a medium of yielding connection between the front diaphragmand the solid back@ By thus yieldingly opposing the thrusts of the main diaphragm, the said supplemental diaphragm insures a wider scope of relative movement between the two electrodes, and a consequent wider variation of the resistance of the transmitter oircuit. I/Vith the provision of the clamping ring G, the parts of the microphone can be readily assembled and taken apart, and at the same time the ring can be screwed down so tightly as to practically insure an airtight joint.

By making the back electrode of less diameter than the front electrode, the said back electrode can be disposed flat-wise upon the rear or auxiliary diaphragm to prevent carbon granules from entering between the said electrode and diaphragm.

Both electrodes, it will be seen, are insulated from the transmitter casing, as well as from the transmitter bridge, the insulation X serving to insulate the back electrode from the said bridge, whereby only the eleotrodes and the cup and the main diaphragm are in circuit.

I claim as my invention:

In a telephone transmitter, the combination of a body or casing, a flat main diaphragm, a threaded metal ring secured to the back of said main diaphragm, a non- 25 metallic supplemental diaphragm, a threaded clamping ring for securing said supplement-al diaphragm to the back of said ring, the said rings constituting a medium of non-yielding connection between the two .3o diaphragms, front and back carbon blocks secured respectively to the main and supplemental diaphragms, granular carbon interposed between said carbon blocks, a bridge back of all said diaphragms, and 35 non-yielding insulating connection between said bridge and said supplemental diaphragm, the front carbon block being movable or vibratory with the main diaphragm, and the said back carbon block being sta- 40 tionary or rigid with the said bridge.

Signed by me at Chicago, Cook county, Illinois, this 21st day of July, 1902.

HENRY P. CLAUSEN.

lVitnesses:

ARTHUR F. DURAND, HARRY P. BAUMGARTNER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

